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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f59694a1a75abf337c3a14c0f7665048aa5a4a7d9728c8225b3ca0b9f39106ca' 
  AND token = 'kcrxQg4UMn+Du62xwcI6wJMceby/iPdYWQLf/3GdbC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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