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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9260475891238ed56d0017ab66b72d2915b46ed1e6c8f4f5fab00abf05c826b1' 
  AND token = 'qrvXITD58FSMs/a/0kOdRgZPVh4kkLq2HDpYQcaO8Ko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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