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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48218b2baf6abdcdf5bd7ab0a506dc6fc8e79580204767dcc6437ca4b7071a7a' 
  AND token = 'pOj1ISmGGzF68QhqQAY9aUostdVXyPQkPi5bolluVcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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