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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e870b15fdeb6ddffd1ddfadd5a0eeafcf10fda15f5d95bf14a7cf459a8f19fd' 
  AND token = 'evS1scFSzzUGJRxWOx/w97bYk9Q1k0LshV1/zvAdCbs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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