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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74f9d3c11a58eff8423c4468ce77a923c4354b63536ff1967b91d9b08fbcb0fd' 
  AND token = 'y8ygmLt2BwLYD5OTut+KMjPfwKicpiV18tr7LF9sPak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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