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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76539baafc252e34b139752a901d80b0ed1d020e739486bd8d63a6b37a37cdc' 
  AND token = '0cfBkwnVhrn+brWEpdXmsPKudI0Tapd/jdQzPeqDwnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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