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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b94bff01f2129c792d3a2e6d824bd5d573ee52a0a555e37ce443773bd3e7c35' 
  AND token = 'nKfJBXBnPZe3H7LT1KaZZAl0F+dCp+BcWGujylkrQPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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