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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552e54998e1a47e8b762ed338e0e05990fa93db9881d6b85d47ee80d6e6ae655' 
  AND token = 'eA5M6WL2udGNxHUeRMBwuUMidnOfTP6QsjQ7yGnOOVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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