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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c68d02dbc0c939f5bc2e5d9ac02ad0ecd0358fff2ed51d61636031433e78468' 
  AND token = 'TNmTAt3PJZqkB5ez1ddm59/XS9f4IIT980OILS6pTwQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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