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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928692f2f9d0ecfc9c10f3849ffd864fcf28c49146c267d2b4ae2e956b176d2e' 
  AND token = 'QoKnoFdJ/QZHjJMm07gEX/2DRZJwB04HUFajCoMQfD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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