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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '331bd64132f288c7b8c6e6d5fd007728f59b67d61a45d926dd7e7de4fc2c5eb1' 
  AND token = 'B/XSnPOuXTk8LhkgfgTR4Od7u+yx8Du9OU5byqgtnos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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