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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f28e7d35e4ba97e8cb94689924f7b05fdc06a4a50fee5f3122895416596c7141' 
  AND token = 'Ee77B6rl8TEYSfI3iRatxcLKKz5QFgVAtFxCQkPH854=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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