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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c700e9ae719c7c0e0dde39a82e18a3235fb859719b972b7543c0230b25bb9817' 
  AND token = '60+HUzXnsTvM98B2TzxyFz3drtxz1mxkD9SmDwLXpiU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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