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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e50d6dc3f539f75a21b3f18ea802c3921f57ed845c7363d8c0ff3bcddc76d5e4' 
  AND token = 'rrF1UZIvklgf9twvWEvQvmIQ3isQ9Su3kKv9qxnGv34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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