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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c9bc6778ff5d2d0621310e444045c30a4c8d2c25054bda5e37ffc19811c6eb1' 
  AND token = 'V/dzkzslUSg2K1UEUcG5hLkpv6L+zsSNmvonOSzKR3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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