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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09b5a170aa76317fa9f36c7494983d6e77a14548b256afc18726ad74c0b75f4' 
  AND token = 'EmQDxbslO7H8dFM6NoZnPWcbX3N711JMsNKtAhSG4ME=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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