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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af05f9bce953d1fb6b88d313d99135e89977bc8aec6c26d3162301619773bc2f' 
  AND token = '57MGbbVrYA6Mej0+t0bfTWv3D2QYAlhWxtFgfPmgMpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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