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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d5f7a1e6c6c6e28fd0f01134a5c1dc1e3625e70646f130df4d599d49a0b9cfe' 
  AND token = 'JfT7z71KVuEGti9uC6BrPUiJ/ezo2C984SJxtZX4+/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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