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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f385f99e0ee0623104a3d81fd870080417aeb88e57919f82ed2033afb857fd8' 
  AND token = 'h5KKEteyrL6Va0izpAGjY8GXPgSxvSAzUS0BIADyWDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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