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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621e1d20ea7b60bcdeefdf6e05c04bbf89cd78f3b112e054d96a6350e8f4ff71' 
  AND token = 'Zc2Is0xTzDYXTEYlB3/t2sGqjm2xzWj4ldZx9nsI6sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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