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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6275d3dda7896dcd17ac42418f8f3e02a9c084604b6d365addf26aa3d143918' 
  AND token = 'TsWjrJ96ePf0Ybbg2nR485VZatWpBTFyxjFPsvhPGUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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