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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e234c631ec43dbc3d247f7066dea6c20629695cde4fe55cd403c877aabab3a6f' 
  AND token = 'v5YPQlUwDf2GqlU+85tRZ7TH4qoX+FAHNZ0P57LpfRM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}