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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dffca96a8372e33a379d8c4a0ff6f1261d07840e6e2ac216ab9819c00dbcd0cb' 
  AND token = '4N3p9bJ2DlpnqKDED997TgZUx3kVe4XOjPej9jK+rUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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