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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd29e96742c173e77dd114166aaaa16f28db0b900e0ea59f4ec130cf83122a5f' 
  AND token = 'I8oMmnSrGfX1mXxMgUcDK+G7+7+1W/7Px6vIne/Xnsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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