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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55221028c397102ceadbeaf5f96a250d82afb443affc4a4cddcda8e81f322d5e' 
  AND token = 'wMsVwZXBO+36Mf1NJSV2ul4pN8lmta2XDG3U5axKjuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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