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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f494924da7251b20fb88f6da9c18397fb154efaadae97bc8d41b6f3ae3ddabf' 
  AND token = '0LgS6xHqyi5wIe3Xt3NXRdAD2FEp7vxb92RXEbzqMvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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