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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c88be24470ee2a736b5363fbab163dd0b017527456913bc52e45cc1617d8d405' 
  AND token = '7jKD9r9QrpQ1y/gPLxal7gl8chwmvR57yz9jqpH4qfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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