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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be34cab753540c8d346b7591cf7b70017163956e2ae592dd35622017bd3dbed6' 
  AND token = '2XQMX4AJJ2o6nfiVmoxwX5UkHmfR/zQKOsScDb36Wa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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