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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a90b44bae697edd31f25001fef951143d9a31133232db3dce4fc13e334c6f0' 
  AND token = '4RMPKW9YBTx2c61O+jqug7NCn6f3H5PWyfey2zIm304=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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