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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc2c023a48a64b039d5885a933f895dc4b102e3dfcb5c4a3e62b9a29b9ac71ef' 
  AND token = 'sCiE6Foy3yo0NsmCNAWFlBvBnz/8GdstGzk+YpbMnbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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