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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c81eb3274ace94c1f42848c4a0607b07bef81045d3b36ee15ab4c4d1ea9323' 
  AND token = 'mJ/3sW+R86qGcPqpDO1ipfLlvHUkh+TnSc9MNTi1jzg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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