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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6958ded2e881f9d95b3cfa2620e250a8df10a3821b62b80703a8a40585c0594' 
  AND token = 'AWxgmuXeUXEq2OYIHEVE8tpEsKZEw4V5dVf5dp6zFJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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