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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '267cd70b38a3d94473c71090fe1cf29ef736026afa30572cd7f28fe0c8c36f44' 
  AND token = 'kWQJ3Uk+FX7BNf4bA4LLrp/aW97X1fGKLEPf6HvJ6O4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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