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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1486ce6999e7c19ef17f3c082b2502a2981fc68667d39c6efdf3c813981a0788' 
  AND token = 'QCoNNRlh0sH9uM7Zqd+ZOZkxSoolfc3KJNXS8t5Hpp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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