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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fc3d3524adb2bc27f834bcbc7cbab583877bc6f0d9aa5d61a3825a10a17a5cb' 
  AND token = 'gnM2yWdwVGg9d64IUCQjl94s/wxupA97uUGxqAVpTA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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