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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64ac5944700cc64739409116b4ebd44bbdc2327cbcff7e43d94c301ff7fa7359' 
  AND token = 'IOH/6mpDpvzMFWWef2Mzir7Satr7NhK/jEaly0JFZng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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