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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b2cadd092869698ea0ec68d07794c82b10c78000f2f9676393ac531c0c9884' 
  AND token = 'gDqNc+NjtM5m8b8nalEX9ktH8T9TX8wyJk+xoTH3PBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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