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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '936e77ba599566b68f1f8ee53027b26a7b1eab150edd32b49cc5e757ca1649c8' 
  AND token = 'Ma2nrKrqRNN7zkaNqTH+2x5b7EBEC6cTHtcntsgfuHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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