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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '799e59c20566d43edaad028b524b5542d26abaddfd307d64290d35296b66676e' 
  AND token = 'wqs3dMS4F2nJa69lY6/ATdXCGQIGySQWY8jFJ8E11H4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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