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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82293119473994782ed072d04b89ef3f3b546450d58c176ed6b4b05e1e53c452' 
  AND token = 'ageKTX3rAf8nLGUCdOzkTrVWl2ikxdVNF5ARdC5H18Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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