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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dadbd33da75119ff0ef6d2b6683bee984e79b07b3ada923800a60e30c691b05' 
  AND token = 'sqbqT/pRXvlQJvtH72+R6DLk8qoRj2No9WIYxrnIe+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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