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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42408468bbcb634c9dd0c93a4e04dbbc45bd2bcca72567e5bef6e2f928b793a8' 
  AND token = 'M6orZ6EvkjcspbO/vnVKguT00aNkIGRBqN2boX1RdS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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