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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24ea12ce59f73bbd9a44c0b4ef8b8d8664abcd543f82480992fd7ef63a6ebfb8' 
  AND token = 'fyxp4PMGqsI6Nxef3KejgWN/sl+/NNVOEAYzfWcbLrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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