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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48ecd82884a5ef6e3484acaa35614c9c7e83b769160f5301c5aa6f7fe32890c6' 
  AND token = 'x3cfFKEGLTD8LqkOthoRi49lT9zJfDH1ISxafO/4trc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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