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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61a10c7af3c5f44b63b36147357ffd2aaa960247e3e69cf2fbf4bea196d67e9' 
  AND token = 'hLHcGR0BMF3pH3DzZTGi7Melz/xPi8xD3SHQpAYn4XQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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