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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aeaa393da170ab4ca6c01938490cb53931e263dacf5335c7b09da9d6256792ed' 
  AND token = 'gAwzvA3SYgqf8m9jLEgvbmeiIl07P/SmKp2/hcGUOWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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