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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e78f81a78ef7086b1889294d6961b225490926b013509eb63fc122f8253854' 
  AND token = 'XnIwbqkGrLAFxwWl5Mq9C/n62N4Zha+l7eiUDoOXkNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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