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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b96eb6fb4f0207550812d028986bb796d26c5dc8a29f3968844125ca8b5906' 
  AND token = 'aoI5qDv8VQ6thKVklw7LzHMAcJekZL6ykqJxePfKIPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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