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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e26f02fa0842150eaf540b79f1d9a31a77282eb3d49409d90ee9b9e79dacf9f' 
  AND token = 'FHTsuK8aLuxzwXetdyN4Y6plu6PIguIwDObQApQutA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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