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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ba3c11ebc8a34e1edaff9cc3a65b5bfd51e8bb47d5e1ea7dde53c025c9d1c9' 
  AND token = 'uAt5CPt2buUff0DnK12HHbodJZ853NakF9gMVRgOFYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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