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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3475306f67b9dc848152082cf7676babd0f10d68d66fb5888fc5427e4827b95' 
  AND token = 'GfOUYApvgq/s3a61pZIaxUUGI/chDvMgumiOm512HUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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