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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '314aba4b3f2f28f7cfd0d2b8bdcccbdc180b11d11afd6e3fb16c8f0d7a4cde2f' 
  AND token = 'ahO5H/cE5oCibIbZCn9Y4BLYTN22XM/W+WCpdCPHN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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