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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a21f6153b755d9eaec6196cc8ff206f7a4f454aac13b23d5fdd0b1beb9dab3f3' 
  AND token = 'Qg6P/goEza7wAxuygGufMmY5sViisNA4JKYdSfrI+Vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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