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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad3f113d6d3dd2b6d16215b86630a2c8662f16ad843cd16d358527f8793e08bf' 
  AND token = '6wjAD69GWpfC3/KkuvAMgLWGiIWYPSWbVq9Sbw9PRWc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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