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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66af1f7e74b90f847b39ab1ba6c92292d19e46854c82eb55df20e0b0142eb6ac' 
  AND token = 'Uk/feQHpIgakKcUZJ5Lic4yKwW63eDlmv9k7SQWcPy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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