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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f9afc676e861a10e30363a9c6ef6c405ae4049f86c73deba97d57e8c8969d32' 
  AND token = 'm73flq83Z5ONWwRrnaEycx1rVHiHyiBp0T/Jk0WNRwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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