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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73ef5c41afa561ebc583a4820266bba937e3c7c17c0d03324516d4947f913432' 
  AND token = 'WUF0QXSoflTCcNYj6nbvo4vpox8ZNN1mqIwiDU5SAwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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