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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f93d68c2dd7666c70180f39c71cc1c52c7aad86f10eeb3f5159e373efb4c68b3' 
  AND token = 'nWlsnrvisgxyP2trCoCK49gii2ba0OTiL/7aSqrnsl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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