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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dffd6ecbf8e846934cf9dc929362a7fcc0fe0eeb40c6b9307db4a0053468eb4' 
  AND token = '22GV4NzRfZ84piCx7L35R5tSLaTS0kKrpw9IuGsxuJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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