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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93ac5078349207c1ab941601c7667c8059b823d0a68b5c92d1c771f6ba3747ec' 
  AND token = '3oRaw1NuFpvbBNHT8VTQVTXUmDZv8qhli0ssIe6RaWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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