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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3308648a5c65580a4a8afb52ecad8ba96d5305f9d769a3cb0d5e47e0e0b1e3' 
  AND token = 'p2GRhrozMZoxM4H+5s0zLBW9YrMNfN+Eawffvdw/yyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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